Constant elow motor



Mar. 3, 1925. 1,528,405

w; CRAIG CONSTANT FLOW MOTOR Filed Oct. 6, 1922 a wwf/Wma' Patented Mar.3, 1925.

PATENT OFFICE.

WILEY CRAIG, OF CINCINNATI. OHIO.

CONSTANT FLOW MOTOR.

Application led October 6, 1922. Serial No. 592,879.

To all whom 'it may concern:

Be it known that I, WILEY CRAIG, a citizen of the United States, and aresident of Cin'- cinnati, in the county of Hamilton and State of Ohio,have invented a certain new and useful Constant Flow Motor, of which thefollowing isla lfull, clear, and exact description, reference being hadto the accompanying drawings, forming part of this specificat-lOn.' 4

My invention relates to devices adapted to be used in connection Withgauges or indicating devices of various characters for the transmissionof an impressed movement by the g'auge or indicator to some otherelement, such as a valve, switch or damper.

Thus in combination with a` pressure gauge in a steam line, where auniform pressure of steam is desired, the movable element of thepressure gauge is connected to my constant flow motor and the motoritself is connected to a steam valve and in gas furnaces, if desired, toa gas valve, to cut down the steam pressure to a point for which thedevice has been set.

I am aware that there are various types of In my-device the primaryobject is to provide a piston which moves from one position to anotheras controlled by a sliding valve or plunger, and in-which the plunger isat all times surrounded by a constant flow of the wer medium, so that itis substantially.

rictionless in operation.

' While I have illustrated my invention as used with a sylphon bellowsconnected toav steam line, it will be understood that this is merely ashowing of one of manypossible uses of my invention. v V

I accomplish the objects set` forth by that -certain construction andarrangement of parts to be hereinafter more specically 'pointed out andclaimed. Y

In the drawings,

Figure g 1 is a central vertical` section through my device.

Figure 2 is a top plan view thereof.

Figure 3 is a side elevation thereof.

I have shown a sylphon bellows 1 connected to a by-pass steam pipe 2 ina steam line 3. I have also shown a steam valve 1 to control steampressure.

Secured to the sylphon bellows is a lever 5 pivoted to a framework 6 andequipped with a eounterweight 7, which is adjustable.

The lever 5 has an arc-shaped shoe 8 on its outer end, to the upper en dof which is connected acable 9, said cable being secured to the plungervalve of the constant flow motor.

The flow motor is formed of a cylinder l() having a main bore 11 of truecylindrical shape, in which bore 11 the piston 12 is operated. Thispiston as shown has suitable cup leathers 13 and a piston rod 14 passingthrough a suitable boss in the cylinder head 15. The inflow pipe 16enters the cylinder head, in this instance comprising` a water pipecarrying water under any normal city pressure.

At one side of the. cylinder are formed series of slots 17, vforming avertical row of wide and narrow ports from the cylinder bore 11. l

The slots each open into a segmental pocket 18, there being a web ofmetal 19 between Aeach pocket. The webs 19 are bored with aligned holesand a valve plunger 21 is guided and reciprocates in these holes. Theplunger passes out through the cylinder head, as in the case of thepiston rod, and is secured to the cable 9. l

A bleed passage 22 is provided extending into the topmost pocket 18, andto the outiow port 28. This outiow port is connected to the lowermostsegmental pockets, and water flowing through the chamber formed by thepockets and the bored webs, passes out through the said port. The fit ofthe plunger in the bores of the pocket partitions is preferably a looseone toavoid friction.

It may now be observed that theA valve Along the cable at some desiredpoint is connected the device to be operated, in this instance the steamvalve handle 27.

The piston is thus held upwardly inthe cylinder by. a weight suficientto counteract the action of the water on the piston, as

controlled by the valve.

below the lower end of the plunger.

Thus in any position of the valve thc counterweight and water pressurewill act on the piston to move it toa position .-to uncover the nextsegmental pocket 'port lVhen the plunger isdepressed, the water cannotflow past the piston so it .forces the piston 'down at the same timeoperating the valve as at 27 'and raising the counterweight until thepistonuncovers a port. not blocked by the valve plunger. \VVh'en it. hasreached such a position which it will do by .a steady as distinguishedfrom a jerky manner, al

position of balance will befinaintained by 30 the counterweight and suchfriction as may be inherent in the device being operated` as the valve27. It will be understood that the port through which the water isdischarged is opened only sufliciently to balance the water pressure andpermit a constant flow.

Upon raising of the plunger the port or ports above. the piston will beopened vincreasing the discharge of fluid and relieving the pressure onthe 'piston as to vpermit the' counterweight to lift it and at the sametime operate the member to be operated. This again will be a gradualoperation.

As will be evident, myfconstructio-n embodies a moving control memberunder substantially no strain in overcoming water pressure as it movesfrom one position to another. Thus on the lower end of the plunger thereis no pressure,V nor .at the upper end. Also lateral pressure isequalized except at the pocket partitions, which are more or lessnegligible. It also em bodies a piston which is always acted upon by twoopposing forces seeking to come to balance, i'. e. the counterfo-rce andthe water pressure. Y

A he resulting device'I have termed a c0nstant ilow motor for lack of abetter term, since water continually flows through the device, exceptwhen momentarily blocked. The prima-ry purpose of the device is notsupplying excess moti-ve power so much as transmitting the action of anundampe'd gauge indicator in a fully damped manner,

resulting from vthe counter-action of twoA forces on the motor'piston.As is apparent,

what I claim as new and desire to secure b v Letters Patent, is v 1. Adevice of the character described, comprising a cylinder and pistoutherein, a series of ports in the cylinder. an inflow and outflow portfor ingress and egress ot' motive fluid for the cylinder, the outflowport connected to said series of ports, and

a plunger movable to close and open the",l

ports of said series, and means foi-equalizing pressure of the motivefluid Aabout said plunger.

2. A device of the character described",`

comprising a cylinder, a series of ports in" the side thereof, pocketsopening into said ports, said pockets having partitions between them, avalve plunger sliding through said partitions, a piston in the cylinder,a counterforce' for` thev piston, a motive fluid inlet to the cylinderat one end of the series of ports, and a motive fluid outletV for theseries of ports located at the other end of the series of ports, as andfor the purposedeseribed.

3. A counterforce .transmission device, comprising a cylinder, a pistontherein, a counterbalance for thepiston, an inflow port and series ofinterconnected outflow ports lengthwise of the cylinder, and a valve.

plunger adapted to control the opening and closing of said orts.

4. A counterbalanced transmission device, comprising a cylinder, apiston thereii, a counterbalance for the piston, an inflow port, and aseries of interspaced outflow ports, having a restricted passage betweenthernand an escape port at one end ofthe series, and! a plunger lying inthe restrictedpassage and movable to close the passage between theports, for the purpose described.

5. A counterba-lanced transmission device, comprising a cylinder, a'piston therein, a counterforce for the piston. an inflow port, and aseries of interspaced outflow ports, having a restricted passage betweenthem and an escape port atone end of the series, and a plunger lying inthe restrictedpassage and movable to close the passage between theports, for the'purpose described, and means, for equalizing pressure'`on said 'plunger as against the motive fluidvmedium WILEY CRAIG.

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